Don't believe the hype...
I agree with this article, I'm not really interested in 4G as I have wifi everywhere I need and a solid 3G signal. I am certainly not going to go out of my way to get it.
I imagine there are only the people who have to have the latest and greatest who have signed up for this as EE's offering is just not near anything resembling value for money. Perhaps EE strategy on this is purposeful, get a few motivated people on it and use them for "testing" as they will be motivated enough to complain to get the bugs out, or even that the infrastructure couldn't cope with a large take up (more likely).
As for everyone else, it just appears that no one wants to break cover until they can see the benefit and with the debts Vodafone and Telefonica are holding I assume they are very reluctant to invest.
The mobile industry needs a shake up sometimes, im my opinion the last two were the Flext tariff from T-mobile and Iphone, I dont think 4G is the next one.